Make a comparison between stream ciphers and block ciphers with example.
Subject Computer and Network Security
NU Year Set: 1.(d) Marks: 4 Year: 2014
BASIS FOR COMPARISON BLOCK CIPHER STREAM CIPHER
Basic 

Converts the plain text by taking its block at a time. Converts the text by taking one byte of the plain text at a time.
Complexity Simple design

Complex comparatively
No of bits used 64 Bits or more 8 Bits
Confusion and Diffusion

Uses both confusion and diffusion Relies on confusion only
Algorithm modes used

ECB (Electronic Code Book)
CBC (Cipher Block Chaining)
CFB (Cipher Feedback)
OFB (Output Feedback)
Reversibility Reversing encrypted text is hard.

It uses XOR for the encryption which can be easily reversed to the plain text.
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